Stereoindex Picks: Stereoindex Picks for Hi-fi Components and System Upgrades

The Auris Nirvana VI is aimed at listeners who want a headphone amplifier with traditional tube architecture and modern control features in one unit.

This sixth-generation model uses American 6CA7 power pentodes, described by the manufacturer as a more powerful development of the EL34 tubes used in an earlier Nirvana version.

Auris has also replaced earlier analog VU meters with a large OLED front-panel display that shows output signal levels and includes a tube operating time counter. The in-house hand-wound output transformers, with multiple secondary windings and Serbian copper wire, underline the company’s focus on matching the amplifier to connected headphone impedance.

Ferrum’s WANDLA is a highly flexible DAC for systems that need broad digital connectivity and balanced output options.

Its inputs include custom-programmed USB, coaxial and optical S/PDIF, HDMI ARC and audio-optimized I2S, giving it a role beyond a conventional desktop DAC.

The conversion stage is built around the ESS ES9038Pro chip with an independent power supply, while the digital section uses an optimized ARM chip intended to keep the signal path short. It also includes MQA decoding and rendering, ESS digital filters, and two filters created for Ferrum by HQ Player.

The PS Audio Aspen FR30 is a full-range floorstanding loudspeaker designed around the goal of exceptionally low distortion.

PS Audio uses its own woofers, midrange driver and tweeter, combined with a phase-correction-optimized crossover that the company says works with the drivers to present an almost flat impedance curve for amplifier matching.

The three-way design is substantial, with four 8-inch aluminum-cone woofers, four 10-inch passive woofers, a 10-inch ribbon midrange and two 2.5-inch flat ribbon tweeters. The two-part cabinet structure and carefully designed enclosure show how much of the FR30’s identity is tied to driver integration and cabinet control.

HEOS Update 36 is not a component, but it is a meaningful ecosystem upgrade for compatible Denon and Marantz streaming products.

The headline addition is Roon support for a number of audio components, giving owners another way to integrate HEOS hardware into a broader digital music library.

The update also improves USB playback control by allowing users to jump to a specific point in a track, expands queue and saved playlist capacity to 1,000 songs, and adds SMB 3.0 support for network sharing from a NAS or PC. Loading-time improvements are also part of the update, depending on content and circumstances.

The Rotel DT-6000 is a CD player created for Rotel’s anniversary line, with changes focused on cleaner and more accurate disc playback.

Its circuit topology was optimized, and the design uses premium components selected through listening tests, including precision capacitors and updated printed circuit board layout techniques intended to reduce noise and distortion.

The digital-to-analog section moves to a 32-bit ESS Sabre ES9028PRO chip configured with four mono DACs for each channel, while analog, digital, transport control and motor circuits are powered from separate transformer windings. A high-precision CD drive mechanism with new controller chips completes the player’s disc-focused engineering.

The SMSL D300 is positioned as an affordable but capable DAC built around ROHM’s BD34301EKV conversion chip.

The source material highlights high transparency, low THD+N figures and support for high-resolution audio streams, while the USB-B input uses a 32-bit XMOS XU-208 interface.

In combination with the ROHM DAC, that USB stage allows playback up to 32-bit 768 kHz PCM and native DSD512. SMSL also includes a CK-03 clock processing circuit intended to reduce jitter, including on coaxial and optical inputs, and uses shielding around the low-noise power stage to limit interference.

The Auris Vivace is a tube preamplifier described by its maker as a reference design, built around ECC88 and ECC82 tubes.

Its appeal lies in a combination of tube circuitry, a substantial aluminum housing and generous analog connectivity.

The input selection includes three RCA inputs and three balanced XLR inputs, making it suitable for systems with multiple analog sources. Analog RCA and balanced XLR outputs are also provided, while the stated dimensions and weight suggest a physically serious component rather than a compact control unit.

The Denon DCD-600NE is a straightforward CD player for listeners who still value physical media and want a conventional hi-fi source rather than a feature-heavy digital hub.

Its aluminum front panel is available in Premium Silver or black aluminum, giving it the understated Denon appearance described in the source.

Construction is presented as robust, with a well-damped disc tray and buttons, and its chassis depth matches Denon’s PMA-600NE amplifier for a visually coherent stacked system when ventilation is respected. The article’s emphasis is clear: sound quality, reliability and classic hi-fi values are the point here.

The Shanling UP6 is a compact Bluetooth DAC and headphone amplifier that also works as a USB DAC with computers or smartphones.

Its internal design uses dual-mono D/A conversion and amplification, with two ESS ES9069Q DAC chips feeding two SGM8262 amplifiers for a fully balanced headphone output.

Connection options include 3.5 mm and 4.4 mm headphone jacks, with the 4.4 mm socket supporting balanced headphones. Wireless support comes from a Qualcomm QCC5125 Bluetooth module with LDAC, aptX HD, aptX Adaptive and AAC, while the XMOS XU316 USB input is included for lossless high-resolution playback over USB.

The Denon Car Audio Concept System with Dirac is included as a forward-looking hi-fi-related development rather than a conventional product recommendation.

Denon and Dirac have created an automotive audio concept using Dirac sound optimization and spatialization technologies, expanding earlier collaboration between the companies into the car environment.

The system described in the source uses 22 speakers and exciters, including headrest and height channels, supports Dolby Atmos, and incorporates components from Audio Foundry partners such as Tymphany transducers and Trèves headrest exciters. Its relevance for hi-fi readers is the attempt to address in-car audio challenges such as speaker interaction and cabin-related distortion through digital optimization.